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Earnings Per Share (EPS) (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Earnings Per Share [Line Items]      
Common stock outstanding, but were not included in the computation of diluted EPS 124,654 255,462  
Options expiration period     2014
Maximum [Member]
     
Earnings Per Share [Line Items]      
Weighted average price of securities excluded from computation of earnings per share 45.20 54.88  
Minimum [Member]
     
Earnings Per Share [Line Items]      
Weighted average price of securities excluded from computation of earnings per share 35.69 37.54  
Restricted Shares [Member]
     
Earnings Per Share [Line Items]      
Common stock outstanding, but were not included in the computation of diluted EPS 232,000 210,000